The experience of Matthew and the video of the monks of Graham shows that a fearless and strong attitude of our whole body and most important of our face is a main point too.
Another point is what our teacher told us in yesterdays class, that we should think of our weight and our strong position and when we use our hips put 2 or 3 times our real weight in the technique. That will take many years to learn too, but we have our all life to learn every detail step by step